Hi VAnMan2014,
Sorry … I don’t keep any records for mattress liquidators because the risk of buying a used mattress that is either a comfort or warranty return is just too high and it would be very rare that they would know anything about the quality of the materials inside their mattresses so I wouldn’t recommend any of them other than as a “buyer beware” purchase. For those that would consider them then a google search will usually bring up some in your area. Craigslist or Kijiji would be other sources for used mattresses as well.
There is more about buying a mattress from a liquidator here and here and here and more about some things you can check for if you are considering buying a used mattress in post #2 here as well.
Phoenix